Question
In a thermal decomposition reaction, the reactant is decomposed by applying heat.
For example, on heating mercury (II) oxide is decomposed into mercury metal and oxygen gas.
$
2 HgO _{( s )} \stackrel{\Delta}{\longrightarrow} 2 Hg _{( l )}+ O _{2( g )} \text {. }
$

Answer

In this type of reaction, the reactant is decomposed by applying electricity.
For example, decomposition of sodium chloride occurs on passing electric current through its aqueous solution.
$
2 NaCl _{( aq )} \stackrel{\text { Electricity }}{\longrightarrow} 2 Na _{( s )}+ Cl _{2( g )}
$

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